<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.d1 {
				width: 200px;
				height: 200px;
				background-color: red;
				position: absolute;
				left: 200px;
				top: 200px;
			}

			.d2 {
				width: 300px;
				height: 300px;
				background-color: dodgerblue;
			}

			.d3 {
				width: 100px;
				height: 100px;
				background-color: green;
				position: relative;
				left: 50px;
				top: 50px;
			}
		</style>
	</head>
	<body>
		<div class="d1">
			<div class="d3"></div>
		</div>
		<!-- <div class="d2"></div> -->
	</body>
</html>
